#undef CONTINUOUS_SCROLL
#ifndef  CONTINUOUS_SCROLL
				if (frame < leftmost_frame || frame > leftmost_frame + current_page_frames()) {
					
					if (session->transport_speed() < 0) {
						if (frame > (current_page_frames()/2)) {
							center_screen (frame-(current_page_frames()/2));
						} else {
							center_screen (current_page_frames()/2);
						}
					} else {
						center_screen (frame+(current_page_frames()/2));
					}
				}

				playhead_cursor->set_position (frame);

#else  // CONTINUOUS_SCROLL
				
				/* don't do continuous scroll till the new position is in the rightmost quarter of the 
				   editor canvas
				*/
				
				if (session->transport_speed()) {
					double target = ((double)frame - (double)current_page_frames()/2.0) / frames_per_unit;
					if (target <= 0.0) target = 0.0;
					if ( fabs(target - current) < current_page_frames()/frames_per_unit ) {
						target = (target * 0.15) + (current * 0.85);
					} else {
						/* relax */
					}
					//printf("frame: %d,  cpf: %d,  fpu: %6.6f, current: %6.6f, target : %6.6f\n", frame, current_page_frames(), frames_per_unit, current, target );
					current = target;
					horizontal_adjustment.set_value ( current );
				}
				
				playhead_cursor->set_position (frame);

#endif // CONTINUOUS_SCROLL